Questions tagged [knife-tool]

The Knife Tool cuts new edges into meshes, adding vertices to user-defined points regardless of existing topology. The Knife Project Tool projects the topology of one object onto another, using the current view angle. Use this tag for questions pertaining to the Knife Tool and the Knife Project Tool.

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Help with using the knife tool

I've been working on a Blender tutorial for making a pencil, and I'm trying to use a knife tool for a part of it. I want to create a new loop that goes around the outside of the model, but it doesn't ...
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How to intrude / extrude a cube (or other irregular shape (knife tool) onto a uniform shape such as a dodec or icos?

In this case a dodecahedron. Using the Regular Solid Tool, I can create a dodecahedron, but, at it's easiest, it then has to be able to rest flat on the grid, which, as it's designed isn't easy, ...
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Removing of self intersection geometry

I was trying to follow this tutorial made in Blender 2.71.x but I haven't figured out how it can be done in 2.93.x yet. He pulls out the self intersecting geometry but when I try and do it, it says ...
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Knife project not working (Blender 2.93.4) [duplicate]

Select the circle Shift select the cube Enter Edit mode knife project And it doesn't work Has something changed? What I'm doing wrong?
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Cutting Shapes Into Another

I'd like to cut a complex pattern into another shape, to produce a square shape with holes of the pattern. However the knife project in both new and older versions of Blender either fails to work at ...
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1answer
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Knife project that's not along view axis?

The knife project tool cuts a mesh by projecting a curve along the view axis. Is it possible to do the same thing using the normals of the curve instead? Imagine engraving text onto a mesh modeling a ...
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4answers
220k views

How would you cut a shape out of an object using another object?

Coming from SketchUp one of the tools I miss most is the circle draw tool which lets you draw a circle on any face and then you could extrude it in/out. The only tool that I know of that comes close ...
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1answer
363 views

How can I cut an edge at the mathematical middle?

I have an edge selected and I need to add a new point that is exactly at the middle of that edge. How can I achieve that?
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735 views

Messed up Topology (Shading?) due to the usage of the Knife Project Tool

Dear Blender Stack Exchange Community, After trying to model a sword (after a concept art) I did run into some issues after using the Knife Project Tool. I am trying to add some Screws using the ...
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4answers
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Is it possible to clip half an object indirectly similar to section plane in SketchUp

Hello beautiful artists, I was wondering if I could clip a finished 3d model to view only a portion of the model without really messing with the object mesh directly. The idea is quite similar to the &...
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1answer
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Rotate view with active knife tool not possible with Maya settings

I am using Blender 2.93 with Maya modelling settings (alt + left mouse button for tumbling). It's not possible to rotate the view while using the knife tool. How can I fix this problem? Thanks for any ...
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blender object doesnt scale, new vertices appear instead

Im new to blender and this happens when I try to scale extrude etc. The object itself doesnt transform and new vertices appear istead.
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Is there a way to rotate and pan view while in knife tool and other tools that lock the view ports?

It seems there are many tools, such as the knife tool, that cause the viewports to lock up when you are "in" the tool. By "lock up" I mean that while in the tool I cannot rotate, pan, or zoom the view....
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Knife tool not cutting anything [duplicate]

My knife tool doesn't work, here is a gif of it.
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Knife project error (Bug v2.93.4) [duplicate]

I've looked through the other posts, none of them helped me. Keep getting "No other selected objects found to use for projection" when trying to use the 'Knife Project' tool. Very confused, ...
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2answers
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How to cut the same geometry into two similar meshes?

I am modelling an airplane, and I want to cut windows into both it's front doors. Every door is a separate object. What I tried: I selected both doors in Object mode I went into Edit mode I pressed <...
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How to add more faces to triangular mesh

I need to add more faces to this selected part. I have tried adding edge loops but that won't work. I have tried the knife tool but that will take too much time to make, any suggestions?
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549 views

Non-manifold, bad contig Edges and Sharp Edges on simple basic geometry

I have had issues trying to produce clean geometry for 3D printing for what is simple geometry. I check wether my mesh is clean or not using the 3D printing addon. Here is a step by step simple ...
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216 views

3D Connexion Space Mouse stops responding during Blender operations

As the question title suggests, I have a minor problem with Blender's implementation of Space mouse/3D mouse control. I finally got the actual operation of the 3D mouse to be like I want. Except ...
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847 views

Blender exported mesh extremely deformed

After exporting my mesh to FBX form to test out my sails in physx clothing, I noticed my mesh was terribly deformed. There were a lot of random spikes and abnormalities that appeared in the main hull ...
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1answer
36 views

How to cut a quadratic hole into a face of a mesh?

I am modelling a house in Blender and want to inset the windows. To do that, I thought I would cut out a quadratic hole from the middle of the plane, then extrude the new vertices and create a face ...
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31 views

Turn knife cut into a lasso knife cut?

is there a way to to turn knife cut into a lasso knife cut? So far its just point clicks but ive seen ppl do a lasso version before, just without explaining how they do it
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1answer
101 views

How to draw edge using an object

is there a way to add an edge like a knife tool, but using an object to follow its shape? I'm having a hard time using the knife tool since it doesn't give me accurate results like curvature when ...
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1answer
43 views

3D Knife Project / Boolean Cut

Say that I have two intersecting cones: Is there an easy way to cut the contour of this intersection into the mesh of one of the cones? While I do have a functional workflow (see answers), it is ...
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Why I can't cut there with the knife tool, I want to make a quad out of this n-gons

Why I can't cut there with the knife tool, I want to make a quad out of this n-gons
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How to deconstruct a ready-made model to view the inside? [duplicate]

okay, so i recently bought the transportation addon from here https://blendermarket.com/products/transportation and i realised it was intricately built.. to the point that the seats, entertainment ...
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How to disable snapping for knife project?

I am trying to cut two different meshes A and B with the same polyline P so that I can join A and B afterwards with no holes or anomalies. I am using the knife project tool and this works quite well. ...
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Cutting one mesh into a bunch o equal sized square meshes?

I have a massive STL I want to print, and I want to print it at a very big scale so I need to cut it into equal sized square parts, as if I was using chicken wire to cut it. I'm also extremely new to ...
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51 views

Artifacts on mesh from making cuts with knife tool?

I'm a creator for the sims 4 and, for the purpose of creating for the game I use blender 2.70 (it's the one I have to use to be able to import to another external app to make new meshes). Anyway, I've ...
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1answer
46 views

knife tool doesn't work [duplicate]

I'm trying to use the knife tool. I click on the tool and it does appear. But when I try to press LMB to cut, instead of the guidelines I am supposed to create appearing, the only thing that happens ...
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41 views

Bmesh: How to select newly created vertices?

I'm running bpy.ops.mesh.knife_project(cut_through=True) using an Edge to Slice a mesh. Next I want to select newly created Edge loop and remove all other vertices. I'm thinking of capturing two ...
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32 views

Brainstorming Recreation of MODO Contour Tool

currently working out how to reproduce MODO's contour tool in Blender. I've tried a couple methods and ran into road blocks. Below is a snippet into my attempts. Ideally this script would be a low ...
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40 views

How to save the knife tool cut line?

How can I save the line before cutting ↲ Enter? I thought of vertex groups, though can't use them for this purpose since the line disappears immediately on clicking outside the mesh.
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Crop Plane to Polygon using Coordinates (Python)

I want to crop a textured plane to a polygon defined by a set of world coordinates. The process must be scriptable using Python. Something like the knife tool, except using defined points instead of ...
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1answer
232 views

How can I cut an edge from a plane?

I wonder what's the best workflow for a such basic task: I want that the plane would have the same two corners. I got stuck at the 7th step. Two questions: How can I cut that duplicated edge from a ...
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27 views

How to export a "sliced face" of an object into a dxf?

I know my question sounds weird but I will try to be specific as possible. Please be patient and please don't flag this question with another question: I would like to hear what everyone needs to say ...
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Help! Im getting these weird streaks/cracks when I knife project

The longs streaks is what happens when I knife project, is there a solution or another method. I am trying to put doors on a plane fuselage
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1answer
55 views

How do I make a cut parallel to an edge?

How do I make the cut in the picture parallel to the active edge? How do I also make sure the thickness of the cut of area is a certain value (in this case 3mm).
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2answers
147 views

How can I fix these artifacts?

I am trying to model this hammer. I used Looptools instead of Boolean as less destructive but it seems these artifacts are inevitable. I included the .blend file. It was mainly a combination of ...
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1answer
38 views

Copying a meshes intersecting outline from the top down view

I have a sliced shape that I would like to copy it's outline as it's seen from the top down view (looking straight down on it). Example: I have an equation that is sliced by a plane using the ...
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1answer
1k views

knife tool 2.8- used in past with no problems

Vertices are not appearing when I drag with the knife tool across the object in edit mode. Am I missing a toggle somewhere? I would include a picture/screenshot but wouldn't really show you anything ...
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273 views

Snap vertex without deforming mesh

Summary of Problem I would like to be able to move vertices, without deforming the surrounding mesh or edge, while snapping to another vertex or move it by a specified unit distance (Not percentage). ...
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1answer
21 views

Using knife tool to cut all around a an object

Please see the following https://www.youtube.com/watch?v=PK36W234WV0 specifically @ 12:40 where the knife tool us used to cut not only the top face but all around the cube. When I try and do this I ...
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43 views

Problems with knife tool

I'm having some problems with the knife tool, sometimes it works and sometimes doesn't. I would like to cut the shape of the lingerie texture at the body but the knife tool works at some places and ...
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1answer
149 views

3D-print friendly joints

I am trying to split a figure, so it will fit in my 3D-printer. For the pieces to fit together after the slice, I plan to make a ball joint or a trapeze joint, and glue them together, just like this: ...
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1answer
534 views

Knife Tool is stuck to the origin of the geometry of the object

The Knife tool is stuck to the origin of the object. I hover all over the vertices and edges, and nothing. There is nothing inside of that object, no hidden vertex, it's literally the origin. I tried ...
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2answers
1k views

How can I cut a complex Blender object in half?

As the title suggests, I have modeled an object, and I want to cut it perfectly in half, or close to perfectly. But as the object is quite complex, nothing I've found on google worked that well and/...
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1answer
2k views

Separate in two parts a Mesh using Knife Project

How can I separate this mesh: Using this plane: In two separate parts, the on above the plane and the one under? Objective: What I want to achieve is to separate the mesh in two part like a ...
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101 views

Subdivision Surface Modifier partly closes holes

I am trying to recreate a wireless phone charger. And the hole for the USB-C input will partly close itself when adding the subdivision surface modifier. The hole is created using the knife tool on a ...
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174 views

Split a Mesh with a curve (knife project tool)

I'm developing an add-on in Blender and I need to manipulate in Blender before developing the tool. My goal : I want to split a mesh in two different meshes with the Knife Project tool in Blender. I ...

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